| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
The objective of this study was to clarify the desalinization process of a reasonable underdrainage system using only rice husk as a main drain (RHUS) in salt-affected fields and to establish the restoration method of the farmlands for technology transfer to developing countries. Small model experiments and three-dimensional numerical experiments in field scales were conducted in this study. The results were summarized as follows;
1) the size of the outlet of rice husk drains (RHD) did not affect the drainage capacity of the system, 2) he amount of water discharged from the outlet increased when the width of the RHD narrows, 3) the RHD accelerated desalinization of a tillage layer by working as bypass of salt water movement from the tillage layer to lower subsoil, 4)It is small that the effect of the gradient of the RHD on the increase of the amount of discharged saline water from the outlet, 5) The RHUS was remarkably effective only for the desalinization of tillage layers.
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